1 // Copyright 2018 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_OBJECTS_FEEDBACK_CELL_H_ 6 #define V8_OBJECTS_FEEDBACK_CELL_H_ 7 8 #include "src/objects/struct.h" 9 10 // Has to be the last include (doesn't have include guards): 11 #include "src/objects/object-macros.h" 12 13 namespace v8 { 14 namespace internal { 15 16 #include "torque-generated/src/objects/feedback-cell-tq.inc" 17 18 // This is a special cell used to maintain both the link between a 19 // closure and its feedback vector, as well as a way to count the 20 // number of closures created for a certain function per native 21 // context. There's at most one FeedbackCell for each function in 22 // a native context. 23 class FeedbackCell : public TorqueGeneratedFeedbackCell<FeedbackCell, Struct> { 24 public: 25 // Dispatched behavior. 26 DECL_PRINTER(FeedbackCell) 27 28 static const int kUnalignedSize = kSize; 29 static const int kAlignedSize = RoundUp<kObjectAlignment>(int{kSize}); 30 31 inline void clear_padding(); 32 inline void reset_feedback_vector( 33 base::Optional<std::function<void(HeapObject object, ObjectSlot slot, 34 HeapObject target)>> 35 gc_notify_updated_slot = base::nullopt); 36 inline void SetInitialInterruptBudget(); 37 inline void SetInterruptBudget(); 38 39 // The closure count is encoded in the cell's map, which distinguishes 40 // between zero, one, or many closures. This function records a new closure 41 // creation by updating the map. 42 inline void IncrementClosureCount(Isolate* isolate); 43 44 using BodyDescriptor = 45 FixedBodyDescriptor<kValueOffset, kInterruptBudgetOffset, kAlignedSize>; 46 47 TQ_OBJECT_CONSTRUCTORS(FeedbackCell) 48 }; 49 50 } // namespace internal 51 } // namespace v8 52 53 #include "src/objects/object-macros-undef.h" 54 55 #endif // V8_OBJECTS_FEEDBACK_CELL_H_ 56